In new press photos and videos, the President can be seen walking up the stairs to board Air Force One while holding an oversize black golf umbrella. It looks to be a normal enough scene, until you realize his wife, Melania, and 11-year-old son, Barron, were following behind, neither of whom were protected from the elements. Of course, Trump may have offered to give them the umbrella—to which they could have said no thanks, we're good—but, well, c'mon.

Regardless of how it went down, it wasn't a great look, and people on social media were clearly displeased.

And it's not just social media users who think Trump's behavior was lacking. Etiquette experts are weighing in, noting that being the leader of the free world doesn't exempt you from common decency.

“We generally try to not comment on individuals, but in terms of principles of etiquette your rank doesn’t absolve you from common courtesy,” Daniel Post Senning, author and spokesperson for the Emily Post Institute, explained to the New York Daily News. “The core tenet of good etiquette is thinking about other people. There’s something classy and thoughtful about considering others.”

So why would Trump behave in such a way? Newsweek has one great theory: It all comes down to protecting his hair over his family.

“She often described the mechanics behind it to friends: an absolutely clean pate—a contained island after scalp-reduction surgery—surrounded by a furry circle of hair around the sides and front, from which all ends are drawn up to meet in the center and then swept back and secured by a stiffening spray,” Michael Wolff wrote about the President's hair in his new book, Fire and Fury: Inside the Trump White House.

This isn't the first time Trump has been accused of unchivalrous conduct. In September Trump literally forgot that his wife was standing right next to him at an event and talked about her like she wasn't even there.

"I just want to thank everybody, the first responders, on behalf of myself, our Vice President—Melania really wanted to be with us," he said as she stood, right there, directly next to him, not saying a word. Maybe Melania and Barron can just slip away in the middle of the night and Trump wouldn't notice. For their sake, they may want to think about it.